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Harry Callahan
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Discussion Starter #1
For anybody that has actually swapped out splits for some comparable size singles - What kind of changes did you notice, especially on the noise?
 

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Well, noise definitely went up but I kinda like the sound better. Sounds more "healthy" to me.

Mileage, in town and towing is definitely up, I think the Terminator helps with that as well. In town I barely have to touch the throttle.

Freeway mpg, I honestly haven't had the chance to do a *good* test.
Example: I got 18.5 on the splits crusing at about 72mph mixed with some in town (denver) driving.

I have ran interstate with the singles, but never a whole tank that slow, usually 75-80 at least.

I do know it got 15.5 pulling a 20' gooseneck (empty), and it maybe would have done 12 before. I possibly attribute that to the 2 stroke oil I'm running as well.
 

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I'm thinking about getting some singles. But nothing to hot I do allot of towing and worried about egt's maybe something in the 40hp range or so. I like the idea of better fuel mileage also. Any suggestions?
 

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If you're keeping a stock HPOP I would go with some 160cc stage 1 singles, or AC codes. (same thing AC's are just factory Int'l, 'Stage 1s' are reworked AA's from an aftermarket shop)

If you plan on twin HPOPs in the future you can go a little more fuel, like 180-195cc and if you keep a stock nozzle it's not too hot on a good tow burn.
 

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For anybody that has actually swapped out splits for some comparable size singles - What kind of changes did you notice, especially on the noise?
Ive noticed with the larger turbo my mileage dropped considerably. I was averaging 17+- with AB's and stock turbo, now its anywhere between 13-14 mpg. My big b codes also average 13-14 with the big turbo.
 

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well, swapped stage 1 singles for a temporary use of stage 2 splits. fuel mileage went way down and power went down as well. this is all with the use of a terminator. Cant wait for the singles to get back!
 

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<<< THE GAUGE WHORE...
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I would say about the same for mine... switched from AD's to stage 2's... didnt knotice any change in fuel stops...
 

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I haven’t had a chance to test it out yet, but at least in theory, singles should give better fuel mileage than splits due to the fact that a single shot gives a longer average burn time per combustion event.

Some people think my injectors are some sort of national treasure, and myself if it ain’t broke I don’t fix it, but I am coming up on 200,000 miles and my injectors have to be getting worn. I may have a bit of a conversation with an injector guy soon.
 

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I had Swamps build me some slightly fun singles when I ruined my splits running Easy Off or something through them. I also had them burn a chip at the same time, so I don't know where it came from, but I'm averaging a 1.5MPG increase. I hand calculate every tank, and I had the splits for 50k miles and the singles for about the same, so it's not a temporary thing, or a single tank miscalculation. The singles are slightly louder. If you want to know how loud, stand next to an OBS.

Don.
 

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Harry Callahan
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Discussion Starter #14
Dave, any news on your plan to try single shots? If anyone can tell us the exact differences, you are the man.
 

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No plans yet. My old injectors are runnin' fine.

If somebody wants me to test them out, I'm listening...
 

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Kinda curious about the people who swapped splits to singles and saw an increase, how many did so when the splits needed to be changed anyway. A set of worn out splits would have a disadvantage compared to a new set of singles, they would have a disadvantage compared to a new set of splits as well.

Hey Dave, mine are at 239K and still going, but then I only get 16MPG.
 

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Diesel Sled Head
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I know I gained mileage from my 290,000 mile splits to stage 1 singles, noise is hardly noticeably louder.
 

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I think I reported this in another thread.

Summer of '08, I swapped for single at 208,000 miles.

Result: Exactly the same MPG. No improvement at all.
 

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Freedom is not free
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I saw about a 1 mpg increase when switching to Swamps 175/146 Single Shots from stock split shots. 15-16 mpg around town and 18 highway if I can keep my heavy foot off the throttle, truck is a 2WD - so it's a bit lighter. Truck definitely holds ICP much better than before and I love towing our 31' 5th wheel with this setup, better power and EGT's seemed to drop a bit also. They are a bit louder at idle......but I like it.

No regrets here.
 
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